“极限”是高中数学中的重要概念,一般情况下,大家往往只把注意力放在求极限值或用定义证明极限等问题上,而对极限思想较少重视.对于某些问题,如果灵活运用极限思想,则可降低问题的难度,优化解题过程.特别是对解选择题,恰当运用极限思想,往往会收到事半功倍的效果. “Utility” is an important concept in high school mathematics. Under normal circumstances, people often only pay attention to the problem of finding the limit value or proving the limit by definition, but they pay less attention to limit thinking. For some problems, if they are flexible, Using limit thinking, you can reduce the difficulty of the problem, optimize the problem-solving process. Especially for the solution of multiple-choice questions, the appropriate use of the limit of thinking, will often receive a multiplier effect.